Match non-empty, ordered combination of Regex patterns

Asked May 05 '18 at 07:10

Active Feb 21 '23 at 13:49

Viewed 102 times

The question is like this: My Regex is constructed with several parts, I want to match a ordered combination of one or more patterns. E.g. If I have three parts, patternA, patternB, patternC, I want to match patternA, patternB, patternC, patternApatternB, patternBpatternC, patternApatternBpatternC. I tried to use (patternA)?(patternB)?(patternC)?, but it suffers from matching empty string.

So the question is how to exclude the matches of empty string or is there any equivalent method that can satisfy the need?

Any suggestion is highly appreciated. Thanks a lot in advance!

edited Feb 21 '23 at 13:49

asked May 05 '18 at 07:10

BookSword

Please write your code here and what your patterns have – Black Mamba May 05 '18 at 07:19
1

The easiest way would be using a negative lookahead: `^(?!$)(patternA)?(patternB)?(patternC)?$` – revo May 05 '18 at 07:34
@revo Thanks a lot! This solves my problem. – BookSword May 05 '18 at 07:43

Match non-empty, ordered combination of Regex patterns

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